EP0182930B1 - Rouleaux magnétiques pour machines à copier et méthode pour leur fabrication - Google Patents
Rouleaux magnétiques pour machines à copier et méthode pour leur fabrication Download PDFInfo
- Publication number
- EP0182930B1 EP0182930B1 EP84114262A EP84114262A EP0182930B1 EP 0182930 B1 EP0182930 B1 EP 0182930B1 EP 84114262 A EP84114262 A EP 84114262A EP 84114262 A EP84114262 A EP 84114262A EP 0182930 B1 EP0182930 B1 EP 0182930B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnetic
- permanent
- fact
- roll according
- components
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
- G03G15/0921—Details concerning the magnetic brush roller structure, e.g. magnet configuration
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/4902—Electromagnet, transformer or inductor
- Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core
Definitions
- the invention relates to magnetic rollers for copying machines and a method for producing the same.
- Such magnetic rollers are used for electrophotographic copiers.
- the magnetic roller is concentrically surrounded by a toner tube, usually made of diamagnetic material, at a short distance.
- the toner tube serves to supply a magnetically attractable toner powder from a powder container onto a carrier material on which the electrostatic image is formed. It is particularly important here that the toner tube has a uniform powder layer in the region of the development zone. However, this can only be achieved if the required induction is exactly present over the respective pole in the working area of the magnetic roller.
- the magnetic rollers consist of a carrier body on which strip-shaped, plastic-bonded permanent magnets extending in the axial direction are provided (DE-B-1 218287, DE-A-3 314 885, DE-A-3 402 864). Due to the manufacturing process and the magnetization of the plastic-bonded, preferably extruded, permanent magnet body in the form of a strip and its mounting on the carrier body of the magnetic roller, both mechanical tolerance fluctuations and magnetic fluctuations can be seen, which result in an uneven course of the induction over the circumference and the length of the magnetic roller or make the toner tube noticeable, do not avoid. These fluctuations are particularly disadvantageous because they lead to banding on the copies made.
- the invention succeeds in creating magnetic rollers which always have the same required induction values over the predetermined radius and / or arc or angular dimension, even if the individual permanent magnet elements have deviations in their magnetic and mechanical values.
- the invention succeeds in creating magnetic rollers which are suitable both for copiers and which have a homogeneous field distribution on the circumference or the predetermined radius of the magnetic roller. i.e. an equal induction between adjacent poles, as well as for copiers that require magnetic rollers, in which the induction between one or more neighboring poles is different.
- the particular advantage is therefore that the magnetic roller according to the invention is universal for most types of copiers can be used.
- Another advantage is the fact that the extensive inventory of permanent magnets with different pole thicknesses that was previously required is no longer required.
- the method proposed according to the invention enables the permanent magnet elements to be precisely adjusted to the required induction value with simple means and in a simple manner. Another advantage is that the magnetic roller manufactured according to the invention has a low weight.
- a magnetic roller 1 is shown according to the invention, which is made of a non-magnetic carrier material 2, such as. B. aluminum.
- the magnetic roller is with an intermediate air gap 3 from a toner tube 4 made of diamagnetic material, such as. As aluminum or non-magnetic steel, surrounded concentrically.
- the magnetic roller moves relative to the toner tube around an unillustrated, e.g. B. one- or two-sided ball-bearing shaft.
- the carrier material 2 of the magnetic roller 1 is provided on its circumference with recesses 5 running in the axial direction.
- Strip-shaped permanent magnet elements 6 are adjustably arranged in these recesses.
- the cross section of the recesses is made larger than the cross section of the permanent magnet elements.
- induction measuring probes for the purpose of adjusting the permanent magnet elements to the required induction value with a predetermined radius r and / or radian b between adjacent permanent magnet elements, induction measuring probes, in the present case Hall probes 7, are arranged in the region of the permanent magnet elements on the predetermined radius.
- the given radius is to be understood as the radius from the center Z of the magnetic roller to a certain distance above the magnetic roller, which in most cases corresponds to the outer circumference of the toner tube.
- the toner tube is usually not yet installed with the magnetic roller. It is sufficient if the Hall probes are arranged and held at the predetermined distance r over the circumference of the magnetic roller.
- the permanent magnet elements 6 are adjusted by radial and / or tangential displacement and / or rotation in the recesses of the carrier material until the Hall probes indicate the required value of the induction. In this adjusted state, the permanent magnet elements are then fixed in the recesses by an injection-molded plastic 8.
- the permanent magnet elements can also be fixed by gluing and / or pouring out with a casting resin or by foaming with a plastic foam. You can also fix the permanent magnet elements by clamping elements 16 before spraying or foaming.
- the carrier material 2 consists of a hub body 9, from which a number of ribs 10 extend outwards in the radial direction.
- the recesses 5 formed between the ribs accommodate the permanent magnet elements 6, which have a segment-shaped cross section.
- the cutouts are larger in cross section than the cross section of the permanent magnet elements, so that the permanent magnet elements can be adjusted within the cutouts.
- Hall probes 7 are in turn provided above the toner tube 4, which indicate the required induction during the adjustment.
- the permanent magnet elements are in turn fixed with an injectable plastic 8, extruded or extrusion-coated.
- the adjusted permanent magnet elements 6 lie within the recesses 5 such that the injected plastic is present on the right of the permanent magnet element or on the left of the permanent magnet element. There is also the possibility that one or more permanent magnet elements are completely encased in plastic.
- the carrier material 2 consists of two disk-shaped end bodies 11.
- the end bodies are in turn provided with recesses 5, into which the permanent magnet elements 6 are adjustably fitted and with the aid of Hall probes, not shown, in the manner described above can be adjusted to the required induction at the specified radius.
- the permanent magnet elements are then fixed with a sprayable plastic 8 or adhesive.
- This configuration creates a cylindrical hollow rung body 12 in which the permanent magnet elements represent the so-called rungs.
- the cylindrical hollow sprout body is then filled with a sprayable plastic foam 15.
- the hollow sprout body 12 is correspondingly trained injection mold 13 brought The injection mold is shown schematically in Fig. 3.
- the end bodies 11 can be cut off at the points shown in dashed lines in the drawing in order to obtain a particularly light and stable magnetic roller against deformation.
- the roller part remaining after cutting must have the required length of the magnetic roller.
- the end body 11 can also be omitted if the multi-part injection mold 13 is provided with laterally removable cover plates, into which corresponding recesses for receiving and adjusting the permanent magnet elements are incorporated.
- the magnetic roller produced according to FIG. 3 is shown in FIG. 4 in a vertical half-section.
- the carrier material 2 consists entirely of plastic foam 15, in which the permanent magnet elements 6 are held in the aligned position. You can see in this figure the aligned position, for. B. the permanent magnet elements 6a is slightly rotated in the axial direction.
- a bearing bush 14 is also injected.
- the temperature of the injectable plastic 8 or plastic foam 15 must be in such a temperature range during its processing that when plastic-bonded permanent magnet elements are used they do not suffer any deformation during extrusion or extrusion coating, but the sprayed-out plastic does not, however, in the cooled state due to the heating of the copying machine is deformable.
- Polyurethane and its derivatives are particularly suitable as foamable plastics. However, it is also possible to use a phenolic resin.
- the permanent magnet elements can consist of sintered, highly coercive permanent magnet material such as barium or strontium ferrite, cobalt rare earth alloys or neodymium iron.
- the permanent magnet elements 6 consist of a mixture of a thermoplastic binder and a powdery, highly coercive permanent magnet material such as barium ferrite or strontium ferrite. A mixture of the two magnetic materials is also possible.
- the permanent magnet elements are molded by extrusion or injection molding. You can either produce permanent magnetic strips directly or plates from which the individual strips are then cut. You can also press permanent magnet elements from this mixture, especially if a thermosetting plastic, such as. B. phenolic resin, is used.
- the cross section of the permanent magnet elements can have any shape.
- the permanent magnet elements preferably have a rectangular, square or segment-shaped cross section. But they can also have a ring section or circular cross section.
- the permanent magnet elements can be magnetized in a radial and / or tangential and / or arcuate direction, depending on the type of copying roller required.
- the magnetization in the radial direction is shown, for example, in the case of the right permanent magnet element 6 in FIG. 1.
- the north pole, identified by an N is located on the surface facing the toner tube 4 and the opposite pole, identified by an S, on the surface of the permanent magnet element facing away from the toner tube.
- the tangential magnetization of the permanent magnet elements is shown in FIG. 4, for example. There this magnetization is identified by the poles N and S in the right permanent magnet element 6.
- the arcuate magnetization is also shown in FIG. 2 for a permanent magnet element 6 by the letters N and S shown.
- the permanent magnet elements are preferably arranged in the carrier material such that the poles, which are directed towards the toner tube, have opposite polarity to the pole of the adjacent permanent magnet element.
- the permanent magnet elements 6 can be connected on the side facing away from the roller surface to a strip-shaped carrier body 17, preferably by gluing, in order to give the permanent magnet element greater stability, in particular to avoid deformations caused by heat.
- the permanent magnet elements can have a smaller thickness and, in a sense, can even be flexible.
- This embodiment with the stiffening carrier body is also particularly suitable for the embodiment of the magnetic roller shown in FIGS. 3 and 4 as a hollow hollow body.
- the carrier body can be made of a magnetically non-conductive material, such as. B. aluminum.
- the strip-shaped carrier body can also be made of magnetically highly conductive material, such as. B. soft iron exist.
- the induction on the surface of the permanent magnet element directed towards the toner tube increases. It is known that the induction of permanent magnets increases when they are provided with an iron yoke; in the present case this can known effect can be used to advantage.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Claims (29)
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP84114262A EP0182930B1 (fr) | 1984-11-26 | 1984-11-26 | Rouleaux magnétiques pour machines à copier et méthode pour leur fabrication |
DE8484114262T DE3472475D1 (en) | 1984-11-26 | 1984-11-26 | Magnetic rolls for copier machines and method of making the same |
AT84114262T ATE35466T1 (de) | 1984-11-26 | 1984-11-26 | Magnetwalze fuer kopiergeraete und verfahren zur herstellung derselben. |
US06/718,637 US4638281A (en) | 1984-11-26 | 1985-04-01 | Magnetic roll for copy machines and method for manufacturing same |
CA000489995A CA1240731A (fr) | 1984-11-26 | 1985-09-04 | Rouleau magnetique pour machines duplicatrices et methode de fabrication |
JP60263964A JPS61148474A (ja) | 1984-11-26 | 1985-11-26 | 複写機用の磁気ロ−ラ及びその製法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP84114262A EP0182930B1 (fr) | 1984-11-26 | 1984-11-26 | Rouleaux magnétiques pour machines à copier et méthode pour leur fabrication |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0182930A1 EP0182930A1 (fr) | 1986-06-04 |
EP0182930B1 true EP0182930B1 (fr) | 1988-06-29 |
Family
ID=8192311
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84114262A Expired EP0182930B1 (fr) | 1984-11-26 | 1984-11-26 | Rouleaux magnétiques pour machines à copier et méthode pour leur fabrication |
Country Status (6)
Country | Link |
---|---|
US (1) | US4638281A (fr) |
EP (1) | EP0182930B1 (fr) |
JP (1) | JPS61148474A (fr) |
AT (1) | ATE35466T1 (fr) |
CA (1) | CA1240731A (fr) |
DE (1) | DE3472475D1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107235335A (zh) * | 2017-06-29 | 2017-10-10 | 江西电力职业技术学院 | 电磁铁质零件捡拾装置以及零件捡拾车 |
Families Citing this family (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4954800A (en) * | 1986-05-20 | 1990-09-04 | Canon Kabushiki Kaisha | Magnet and method of manufacturing the same |
JPH0192777A (ja) * | 1987-10-05 | 1989-04-12 | Fujitsu Ltd | マグネットローラの位置調整方法 |
US4823102A (en) * | 1987-10-05 | 1989-04-18 | Xerox Corporation | Magnetic roll for a copier |
JPH0195277U (fr) * | 1987-12-17 | 1989-06-23 | ||
US5030937A (en) * | 1989-08-02 | 1991-07-09 | Xolox Corporation | Magnet roll |
US5019796A (en) * | 1989-12-22 | 1991-05-28 | Eastman Kodak Company | Bar magnet for construction of a magnetic roller core |
US5581422A (en) * | 1993-02-09 | 1996-12-03 | Hitachi Metals, Ltd. | Actuator with moveable coil and recording apparatus |
DE4311398C2 (de) * | 1993-04-07 | 2000-12-28 | Kobold Klaus | Flügelrad für Durchflußmesser |
FR2710113B1 (fr) * | 1993-09-16 | 1995-12-22 | Aerospatiale | Barreau magnétique courbe ou rectiligne, formé d'aimants disjoints. |
US5558091A (en) * | 1993-10-06 | 1996-09-24 | Biosense, Inc. | Magnetic determination of position and orientation |
DE69529753T2 (de) * | 1995-11-07 | 2003-10-16 | Oce Nederland Bv | Magnetsystem für ein bilderzeugendes Gerät |
DE19543316A1 (de) * | 1995-11-21 | 1997-05-22 | Bielomatik Leuze & Co | Bearbeitungs-Werkzeug zur Bearbeitung von Lagen-Material o. dgl. |
US6061541A (en) * | 1996-09-04 | 2000-05-09 | Clarity Imaging Technologies, Inc. | Supplemental magnet strip for toner cartridge developer roll magnet and method for employing the same |
US6125255A (en) | 1996-09-23 | 2000-09-26 | Xerox Corporation | Magnet assembly with inserts and method of manufacturing |
US6452380B1 (en) | 2000-03-23 | 2002-09-17 | Lexmark International, Inc. | Rod and apparatus for calibrating magnetic roll testing apparatus |
JP2002287502A (ja) * | 2001-03-23 | 2002-10-03 | Ricoh Co Ltd | 現像ローラ |
US6862415B2 (en) | 2001-06-27 | 2005-03-01 | Eastman Kodak Company | Device for treating the surface of an article in connection with printing |
US6897752B2 (en) * | 2001-07-25 | 2005-05-24 | Lexmark International, Inc. | Magnetic roller and methods of producing the same |
US6850140B1 (en) | 2003-09-10 | 2005-02-01 | Magnetic Technologies Corporation | Layered magnets and methods for producing same |
US7373716B2 (en) * | 2003-10-22 | 2008-05-20 | Dexter Magnetic Technologies, Inc. | Method for constructing permanent magnet assemblies |
EP1680230B1 (fr) * | 2003-11-07 | 2010-06-23 | SGM Gantry S.p.A. | Separateur magnetique a aimants permanents de ferrite et de terres rares |
US7135792B2 (en) * | 2004-05-12 | 2006-11-14 | Dexter Magnetic Technologies, Inc. | High field voice coil motor |
JP2008233368A (ja) * | 2007-03-19 | 2008-10-02 | Ricoh Co Ltd | マグネットローラ、現像剤担持体、現像装置、プロセスカートリッジ及び画像形成装置 |
US20100123779A1 (en) * | 2008-11-18 | 2010-05-20 | Dennis Michael Snyder | Video recording system for a vehicle |
DE102017104895B4 (de) * | 2017-03-08 | 2021-08-19 | Preh Gmbh | Formgebendes Verfahren zur Herstellung eines einen Permanentmagneten aufweisenden Verbundteils |
CN111111908B (zh) * | 2019-12-02 | 2022-04-01 | 宁波西磁磁业发展股份有限公司 | 一种磁板补偿式皮带除铁机 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1079237B (de) * | 1956-09-22 | 1960-04-07 | Marius Cominoli | Magnetische Befestigungsvorrichtung fuer einen an ferromagnetischen Metallflaechen magnetisch haftend festzulegenden Gebrauchsgegenstand |
DE1176440B (de) * | 1962-04-26 | 1964-08-20 | Max Baermann | Riementrieb mit magnetischer Verstaerkung des Kraftschlusses |
DE1218287B (de) * | 1962-12-21 | 1966-06-02 | Zindler Lumoprint Kg | Vorrichtung zum Entwickeln elektrostatischer Bilder |
FR1475501A (fr) * | 1966-04-13 | 1967-03-31 | Deutsche Edelstahlwerke Ag | Pôles d'aimants permanents pour systèmes d'aimants permanents |
CH501892A (de) * | 1968-09-06 | 1971-01-15 | Siemens Ag | Vorrichtung mit einer magnetischen Teilung zur Erzeugung von elektrischen Signalen in Halbleiterbauelementen |
US3641969A (en) * | 1969-12-18 | 1972-02-15 | Plastic Coating Corp | Toner unit for photoelectrostatic reproduction |
US3663850A (en) * | 1970-08-03 | 1972-05-16 | Phelon Co Inc | Field means for a dynamoelectric machine, magnet preassembly for use therein |
GB2052319A (en) * | 1979-05-15 | 1981-01-28 | Lucas Industries Ltd | A method of assembling permanent magnet rotors for electrical machines |
CA1198766A (fr) * | 1981-04-20 | 1985-12-31 | Atsuo Tanaka | Rouleau magnetique et methode de fabrication |
JPS59139067A (ja) * | 1983-01-29 | 1984-08-09 | Ricoh Co Ltd | マグネツトロ−ル及びその製造方法 |
US4558294A (en) * | 1983-03-31 | 1985-12-10 | Hitachi Metals, Ltd. | Magnet roll and method of producing the same |
DE3314885A1 (de) * | 1983-04-25 | 1984-10-25 | Max Baermann GmbH, 5060 Bergisch Gladbach | Magnetwalze fuer kopiergeraet |
-
1984
- 1984-11-26 DE DE8484114262T patent/DE3472475D1/de not_active Expired
- 1984-11-26 EP EP84114262A patent/EP0182930B1/fr not_active Expired
- 1984-11-26 AT AT84114262T patent/ATE35466T1/de not_active IP Right Cessation
-
1985
- 1985-04-01 US US06/718,637 patent/US4638281A/en not_active Expired - Fee Related
- 1985-09-04 CA CA000489995A patent/CA1240731A/fr not_active Expired
- 1985-11-26 JP JP60263964A patent/JPS61148474A/ja active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107235335A (zh) * | 2017-06-29 | 2017-10-10 | 江西电力职业技术学院 | 电磁铁质零件捡拾装置以及零件捡拾车 |
Also Published As
Publication number | Publication date |
---|---|
EP0182930A1 (fr) | 1986-06-04 |
DE3472475D1 (en) | 1988-08-04 |
CA1240731A (fr) | 1988-08-16 |
US4638281A (en) | 1987-01-20 |
JPS61148474A (ja) | 1986-07-07 |
ATE35466T1 (de) | 1988-07-15 |
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